Use Matrices to Represent Systems of Linear Equations - Expii

Let's say we have the system of equations:. \[\begin{cases}. x + y + z &= 6 \\. 2y + 5z &= -4 \\. 2x + 5y - z &= 27 \\. \end{cases}\]. You can certainly solve this through elimination, but let's try a d.